5.1.1

Chapter 14 Particles 533
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Start Point: This parameter, which becomes available when Shape is set to Line or Wave,
consists of two value sliders that dene, in X and Y coordinates, the rst point of the line used
as the emitter shape. Click the disclosure triangle to modify the Z position of the start point.
You can adjust these values in the Canvas using the onscreen controls (with the Adjust Item
tool).
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End Point: This parameter, which becomes available when Shape is set to Line or Wave, consists
of two value sliders that dene, in X and Y coordinates, the second point of the line used as
the emitter shape. Click the disclosure triangle to modify the Z position of the start point. You
can adjust these values in the Canvas using the onscreen controls (with the Adjust Item tool).
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Emit At Points: This checkbox is available when any of the following is chosen in the Shape
pop-up menu: Line, Rectangle (with Arrangement set to Outline or Random), or Circle (with
Arrangement set to Outline or Random), Burst, Spiral, Wave, Geometry, Box (with Arrangement
set to Outline), or Sphere (with Arrangement set to Outline). When the Emit At Points
checkbox is selected, particles emerge from a limited number of points (as dened in the
Points parameter). When the checkbox is deselected, particles may emerge from anywhere
on the line or edge. When the Adjust Item tool is selected, the points become visible in the
Canvas. When Emit At Points is selected, two additional parameters become available: Points
and Oset.
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Points/Points Per Arm: This slider becomes available when any of the following is chosen in
the Shape pop-up menu: Line, Rectangle, Image, or Circle (with Arrangement set to Outline or
Random Fill), Burst, Spiral, Wave, or Geometry; in addition, the Emit At Points checkbox must
also be selected. Denes the number of points where particles are emitted. For Rectangle or
Circle shapes, the particles are emitted from evenly distributed points along the edge of the
shape when Outline is chosen from the Pattern pop-up menu. When the Adjust Item tool is
selected, the points are visible in the Canvas.
Using a large number of points slows your computer’s processing performance.
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Radius: This slider becomes available when one of the following is chosen in the Shape
pop-up menu: Circle, Burst, Spiral, or Sphere. Denes the size of the shape from which particles
are emitted.
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Twists: This slider, available when Spiral is chosen in the Shape pop-up menu, denes the
number of turns in the spiral. The default value is 0.25.
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Number of Arms: This slider, available when Burst or Spiral is chosen in the Shape pop-up
menu, denes the number of branches from which particles are emitted. The default value is 3.
Spiral emitter shape set to default Number
of Arms and Twists
Spiral emitter shape with Number of Arms
set to 3 and Twists set to .70
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Amplitude: This slider, available when Wave is chosen in the Shape pop-up menu, denes half
the distance from the highest point to the lowest point in the wave. Higher values result in
more extreme waves.
67% resize factor